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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9a2e1c0e60b154a8d41bfae7a5c86b9bb38788714c27c4910b1491262a9fcf1' 
  AND token = 'D9xzty/1d23gHoZ6GBRP+5waamPPRmVVZe/3CC/iHco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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