SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08e976d8c85866b8db464e581df6dee674b8b9897e542ce0dc93b66f9e141049' 
  AND token = '3Bog7anu3q53pf1YwaIKtChReJ/uBjExUubfksZ2fq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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