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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c117eaf262e25d9cbc44881123493f12921187c2d9dca5c7c1b7cdb4f4b215fc' 
  AND token = '5YcyvMEDx5hpsyjRhaG3mQgwj6ON0T+Shp1T3Ci9E2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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