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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '430ce94c719344059ee1b1ff99ee960eaef24becd183e07c0119d85daab133ef' 
  AND token = 'SO+IhNmgBBGnpi52cLWr72d2DsmmPYJONRbDyiMulaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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