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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f28a336ebff4b6151a862fe54a7d8a82e8e7128140e5a0c32e8f090b1b6dd7bd' 
  AND token = 'g3RYuJJkwh2F5pK8A0tiA7JZQsDpOrgaZMQ4pKwTAjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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