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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d728dc2c3e609216bb2a4cf4a82efa637f0434dbeb7a9512fa301f22767419e' 
  AND token = '94Ct9M8xuQOlUh8rp6UpO/PjnChiho8Wl/1peAhIZmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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