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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '128e82300f24dc2c4e9fec5c9d676d46941c8a17acce5e15c422a674c72d98d5' 
  AND token = 'Nlrrq7NBmcUH354Dc5unUUJoCi0YYfdw7fEjTKnTTG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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