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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5ab1bdd23d36c66f1c7ea95e7de273e261d17509d0ebf1eb481dd77e5b6665a' 
  AND token = 'lU7DiVFkuhypa/y9F35UyVyw6S1q8ES8PprOIfF5QUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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