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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b5c84b32e023498fba7e75c120b43f84cbac200f07f93c90135f8026d27afd4' 
  AND token = 'OzzNyE2u6Xqv3Nouyuusnmzpw2Ymh5oWg3ir9ZrYMNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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