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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '791243b3c3dc58753ac4bf6596b713efeaf41014be17194a17aede4297552639' 
  AND token = 'HiN6ISM/CRYC/KULKQDDEc/6o8hx9Kc1KyQ/4K78jIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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