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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b91090502b5017ca23936ada155d62d1d264d941d0d67fee8b7dae8d60cd0409' 
  AND token = 'kN/XivAbtLNgc+RHlbrrWmQ5p3OSzKmPxYU89vxSw2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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