SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be286a1a4241a5d5f4a9803f594c0ab6174f60f9b8774b29fbb1fc1678d34c34' 
  AND token = 'wzjbie6Uijds+LcNsCfL3lP5yjYLBlKpaGidonqBi1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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