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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fdf04f090da624030bbd43fd4b814dc92b092b14438d0429db92948d8b5ab030' 
  AND token = 'H2E9RG6lMRtCLab5/7UhoG/CnhLi+u8KKgWWHOLm/1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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