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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a49c468bf69168e412f94c9554781cabba732a5ba51aaf0529e56b7b1db31cb' 
  AND token = 'wKKr9HpMg4HHQZ1xj4ZOCkBHbaj3y7eNer/Nn9tb5H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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