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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '573e37b5bc9b45bc53ceab37981dd8b226ba8da3eb4032fc154fb1de9997ee2b' 
  AND token = '8JZGW+J4+QwhuI3LbbhgljETJW18MucuCGXrXtU+FZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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