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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed3b6d584a83f342cfe28bb439b9d3d7f5f652d6d51b7feb6d4dd547a266f471' 
  AND token = 'Xrxq0NrXBcdpaYLht611U0Rpb/4fd37T51fwKM4pmmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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