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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d9f4e1ba47314a844fd075f440e012017c85fc9841b7a945ebd77e5709af59a' 
  AND token = 'g5UPgqr3H+gPKENfUXKgwnHLogi3yKsMzc4Ttb1Wj3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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