SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c022ae8dc0fa6aebef5c79fd369f6d3198abc40930bfe6009f1069f0420bc408' 
  AND token = 'cVgGji0PhqGLPvIRq2K3b2uAZUHOpVzkiiwouocL/Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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