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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c18479263fbdcf8c1f279e616d760e7ca2665b58fb4c56d08c0e6ccb9c68e439' 
  AND token = 'I3XUdsqAmJE4nWM/2CaU1eT+e0MqMdvUsUqQFMU6Hoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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