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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '697fc0c31ecc575838d751908fe47f206b956a684cde2247ccc9d833350815e3' 
  AND token = 'wLfqDJg/3UEtGIcEht6TQr2u5Hx9RraSn630hQJ45t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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