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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0da4b3d37cc88f809b0bc7789accbb5a8b0b3df1f5f66e04c8fc6cc6c8db03da' 
  AND token = 'E3DeYIPJS5cYlf8JDCD+SYA0BO6aT3MqvLdlaykVNRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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