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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6240d36fc675eef81f100665644320c1659f522152dd6069482ad20450a64ca8' 
  AND token = 'lwc4QqkPSTrbIDP/lnn4qIjlpFHO5ohnggZi2E1ifDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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