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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb0327d076ed61aa3303220db22cb4c5cede4cfe12adb7eae3adde72b6380a4e' 
  AND token = '7vVUCM4XElNDR81KckoswLfJBJiXUGV3Jjas39FrNlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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