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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e823fc5b897497d9e5b96277ea20a83e68f24348f1f65544b7eb10a288ad94a6' 
  AND token = 'HkinpdGTykxKYPnVkiYzsw6I3k0S3AMcvn+RwVe1KoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00174

JSON explain

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