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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5ae2d7e3e8412bb8b2fab173ea40901cae7ba61b512d51c62c6a502e407e867' 
  AND token = 'zYC4h6F6SoKbQ3+dHzckEpJZ2nnD4YgdImCQyvEL3Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}