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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4305db34d11b7c990cd111d5d68b7e9f4fdb3539a45a5be8224463f09ad19f0' 
  AND token = '9DT9eJoCbvYVRiObkEwWwyLVwRYZZOOkxWHv+Eia/Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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