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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '840d2fd0a74ce96ed8f01d6a3506bc290118cfea1d08de545df892bfc791c429' 
  AND token = 'NCXOKaNQjYZg0kj/GjzHX1R642eoJ9c0FKHiW3fRbpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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