Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff7cbfb74fadfc0b1cb9195f876c09ec2eb1021c1e462732ee29b9b4407024a8' 
  AND token = 'ZIZ7/3isxodmZqm2wTcLrCyzVW+JcT4kBH8diZ/Om3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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