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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b4bde376e00969325f3db2b727b8e1826b43a408726b9c7928d427ac8a20583' 
  AND token = 'PbLn3o8mQAm7aW9+iBaWg3uqWuKDLSr+jGReD2g9qOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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