SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99c7f38d75871b5014d33104fa613b5b3f0e7b60af6367ebfda2dfc0d7fee812' 
  AND token = 'AEsHXryGq4p/PdDnQ28a54VAJz75s1iNYqGjIZWAC9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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