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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc12f13385ed8ee0af86e05b0db1ecef3e5f6967e9f1b4eab15db60fce12640a' 
  AND token = 'bhybB/VL25gU2jIJQSjhKkyaT/KEG9Nh/Q5KCb7nbVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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