Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a5640ea148ec9b3b26ec88cd0f8f3d4b458c047e3aae8bf0c28f0f07aad2410' 
  AND token = 'm1tyV/Qonck8N0tlKSRh8xS3Xw9Sami4nRVmhxwF9CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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