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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adebb5febb16f52c78b90d72077358f052bd3a66404414d9ddd3d565bcbca97d' 
  AND token = 'lVVUinaOQkcmzLYu3EweOk9D1TEi0YARa3XownDrBxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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