SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c7b47c2853b6c8e92721e4f5efa3f6dd0ad768ebb6686ff8f7a39a5f61a6e40' 
  AND token = 'DruQlkT5hYTlNpfjmAGIVqSYpzqU133pl/IJ8wrOPE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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