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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bf10bc7546031b15332ffb2ee3cae286d108be5cf17a41daf35c441d69e51b1' 
  AND token = 'bQoRwIqamJS2Onw74Ahu8j3kTooGmdqYvDsWzsaV59E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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