SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7697ef31324fa80f6da66497e5382bcdc58f1d7c12f6c8c1660287361b17ae84' 
  AND token = 'mZ9hmswvWufdhqRVUtOEGK3aDV2rntUz4kFOWnmoN8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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