SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95b5b6f220247d427f17e52cb8bfa6b1e8dd41442a767f5db14129a909a86206' 
  AND token = '6F+pBK02ZZ6tJh7LJ4/fy3OXEpN02G0N/lVVBQJk+kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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