SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d310592d0b2876b05f27ef545222f05569bb522dde7a138c4b0a8638d463106' 
  AND token = 'EWfK2BdBAeNAdmmuN6VuCIxDzjFNRtZHoglBv3pOqMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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