SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d5428c113179c42d1c53587df5551654b206dcd960721d64cdaf1c8d43f3bc5' 
  AND token = 'TJOql4m5pL+FvG5q+7Mqg0VeucjP2evUZizOYDsDFmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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