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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd24e10917ee53298401d9c611fd778e3b306b07939f7bcd9dbf345a21dd1092f' 
  AND token = 'VcihOTDHabXkL8VxhLKAtTeqlOQe2coTa1PZi89WJHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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