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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f09ccb2310cb0e5b336eb6e0fb2bf43aa67ddee3501e818a2f12994f92b0a800' 
  AND token = 'Pz387jZr6RukXKowE056b8eYr1jioshjmSVJxRd/4+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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