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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '844882aa809b2de31e3dff64f721ef2a17c2430b78d10a5c2b103fe90090abed' 
  AND token = 'Yx9xX7mA2VYV4XuQTF+FuafwPi76EhI38C50fqwRovU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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