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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9920cc45121a7f45d2ceba4e174a03ccdfa8f4307fc3e251ed4b90dc5520d083' 
  AND token = 'V+v1JMmEcXMjS8Xo5G+KJ1nX+74/1O4HY5ZT37YjH38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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