SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '932293cc065802dc5d72de8306ed417b914a8e7ecf91166004349f010e547621' 
  AND token = '3J8Z7XsSgPgddDiU9mXaTIZ8k4K/x+/uPqBa5lhXSx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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