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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7d272a061ac2d9d2705d47d224382d83ddf827750afee0e5f9aba704ee37da2' 
  AND token = '95+4EsAn/6i0OSD0uCJKlOYxkDM6Ln2yyXWUI9GQXdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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