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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b136f923c632b27bf648b534544397cb81f512a9bbff450a71c29d25f0d05cf' 
  AND token = '1lNdlg3pA0lB3DpLgIReLeLBeFrTdgVToFDut1UYdjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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