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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3970c2575cd4390fcf1903e37cafad70a6cef48441f9679a7fd89010b5ec0d29' 
  AND token = 'puAc+8svwlwWAg05WEIvbolHaxo4ywF6elBWKOTDQig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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